The PhaseCam 4010-MW is a polarization-based Twyman Green dynamic multiple wavelength interferometer. Its development required the invention of an achromatic, high-speed phase sensor and a high-accuracy, relative wavelength calibration method. The system can acquire data at a single wavelength 5000 times faster than conventional temporal phase-shifting or vertical scanning interferometers and can measure surface shape across discontinuities 15,000 times larger than a typical single wavelength interferometer. It can measure diffuse and specular surfaces and has a wide variety of applications, including semiconductor and industrial inspection.